Thrush after unprotected sex

So almost every time that my partner have sex without a physical contraception such as a condom, I always seem to develop thrush.
Can anybody offer any advise on how to prevent this? 
I have an implanon implant, so we don't use condoms etc. but this is beginning to be a problem for me, and is starting to make me feel quite self conscious.
Can anyone help?

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